<?php
/* SMTP Class
 * Example:
 * $x = new SMTP('smtp.qq.com',25,true,'kenvix@qq.com','*************');
 * $x->send('God.Kenvix <kenvix@vip.qq.com>','God.Kenvix <kenvix@qq.com>','f','fff');
 */
//namespace lib;

class SMTP
{
    public $smtp_port;
    public $time_out;
    public $host_name;
    public $log_file;
    public $part_boundary = '--PART-BOUNDARY-ID-WRG11-Y4RD1-5AS1D-RE4D1-AF1EG---';
    public $relay_host;
    public $debug;
    public $auth;
    public $user;
    public $pass;
    public $sock;
    public $log;
    public $error;
    public $att = array(); //附件内容
    public $ssl = false;

    public function __construct($relay_host = '', $smtp_port = 25, $auth = false, $debug = false, $user, $pass, $ssl = false)
    {
        $this->debug = $debug;
        $this->smtp_port = $smtp_port;
        if ($ssl == true) {
            $this->ssl = true;
            $relay_host = 'ssl://' . $relay_host;
        }
        $this->relay_host = $relay_host;
        $this->time_out = 30;
        $this->auth = $auth;
        $this->user = $user;
        $this->pass = $pass;
        $this->host_name = "localhost";
        $this->log_file = "";
    }

    /**
     * 添加一个附件
     * @param string $name 文件名
     * @param string $value 文件内容
     */
    public function addatt($name, $value = '')
    {
        $this->att[$name] = $value;
    }

    public function send($to, $from, $subject = "", $body = "", $fromname = "", $reply = '', $cc = "", $bcc = "", $additional_headers = "")
    {
        if (empty($reply)) {
            $reply = $from;
        }
        $header = "";
        $mail_from = $this->get_address($this->strip_comment($from));
        $from = "=?UTF-8?B?" . base64_encode($fromname) . "?= " . "<$from>";
        $body = mb_ereg_replace("(^|(\r\n))(\\.)", "\\1.\\3", $body);
        $header .= "MIME-Version:1.0\r\n";
        $header .= 'Content-Type: multipart/mixed; boundary="' . $this->part_boundary . '"' . "\r\n";
        $header .= "To: " . $to . "\r\n";
        if ($cc != "") {
            $header .= "Cc: " . $cc . "\r\n";
        }

        $header .= "From: " . $from . "\r\n";
        $header .= "Subject: " . $subject . "\r\n";
        $header .= $additional_headers;
        $header .= "Date: " . date("r") . "\r\n";
        $header .= 'Reply-To: ' . $reply . "\r\n";
        $header .= "Content-Transfer-Encoding: base64\r\n";
        list($msec, $sec) = explode(" ", microtime());
        $header .= "Message-ID: <" . date("YmdHis", $sec) . "." . ($msec * 1000000) . "." . $mail_from . ">\r\n";
        $TO = explode(",", $this->strip_comment($to));
        if ($cc != "") {
            $TO = array_merge($TO, explode(",", $this->strip_comment($cc)));
        }

        if ($bcc != "") {
            $TO = array_merge($TO, explode(",", $this->strip_comment($bcc)));
        }

        $sent = true;
        foreach ($TO as $rcpt_to) {
            $rcpt_to = $this->get_address($rcpt_to);
            if (!$this->smtp_sockopen($rcpt_to)) {
                $this->log_write("Error: Cannot send email to [ " . $rcpt_to . " ] (Step 1)<br/>" . $this->error);
                $sent = false;
                continue;
            }
            if ($this->smtp_send($this->host_name, $mail_from, $rcpt_to, $header, $body)) {
                $this->log_write("邮件已成功发送到 [" . $rcpt_to . "]\n");
            } else {
                $this->log_write("Error: Cannot send email to [ " . $rcpt_to . " ] (Step 2)<br/>" . $this->error);
                $sent = false;
            }
            fclose($this->sock);
        }
        return $sent;
    }

    private function smtp_send($helo, $from, $to, $header, $body = "")
    {
        if (!$this->smtp_putcmd("HELO", $helo)) {
            return $this->smtp_error("sending HELO command");
        }

        if ($this->auth) {
            if (!$this->smtp_putcmd("AUTH LOGIN", base64_encode($this->user))) {
                return $this->smtp_error("sending HELO command");
            }

            if (!$this->smtp_putcmd("", base64_encode($this->pass))) {
                return $this->smtp_error("sending HELO command");
            }
        }
        if (!$this->smtp_putcmd("MAIL", "FROM:<" . $from . ">")) {
            return $this->smtp_error("sending MAIL FROM command");
        }

        if (!$this->smtp_putcmd("RCPT", "TO:<" . $to . ">")) {
            return $this->smtp_error("sending RCPT TO command");
        }

        if (!$this->smtp_putcmd("DATA")) {
            return $this->smtp_error("sending DATA command");
        }

        if (!$this->smtp_message($header)) {
            return $this->smtp_error("sending head message");
        }

        if (!$this->smtp_sendbody($body)) {
            return $this->smtp_error("sending body message");
        }

        if (!$this->smtp_sendatt()) {
            return $this->smtp_error("sending attachments message");
        }

        if (!$this->smtp_sendend()) {
            return $this->smtp_error("sending end message");
        }

        if (!$this->smtp_eom()) {
            return $this->smtp_error("sending <CR><LF>.<CR><LF> [EOM]");
        }

        if (!$this->smtp_putcmd("QUIT")) {
            return $this->smtp_error("sending QUIT command");
        }

        return true;
    }

    private function smtp_sockopen($address)
    {
        if ($this->relay_host == "") {
            return $this->smtp_sockopen_mx($address);
        } else {
            return $this->smtp_sockopen_relay();
        }
    }

    private function smtp_sockopen_relay()
    {
        $this->log_write("Trying to " . $this->relay_host . ":" . $this->smtp_port . "\n");
        $this->sock = @fsockopen($this->relay_host, $this->smtp_port, $errno, $errstr, $this->time_out);
        if (!($this->sock && $this->smtp_ok())) {
            $this->log_write("Error: Cannot connenct to relay host " . $this->relay_host . "\n");
            $this->log_write("Error: " . $errstr . " (" . $errno . ")\n");
            return false;
        }
        $this->log_write("Connected to relay host " . $this->relay_host . "\n");
        return true;
    }

    private function smtp_sockopen_mx($address)
    {
        $domain = preg_replace("/^.+@([^@]+)$/", "\\1", $address);
        if (!@getmxrr($domain, $MXHOSTS)) {
            $this->log_write("Error: Cannot resolve MX \"" . $domain . "\"\n");
            return false;
        }
        foreach ($MXHOSTS as $host) {
            $this->log_write("Trying to " . $host . ":" . $this->smtp_port . "\n");
            $this->sock = @fsockopen($host, $this->smtp_port, $errno, $errstr, $this->time_out);
            if (!($this->sock && $this->smtp_ok())) {
                $this->log_write("Warning: Cannot connect to mx host " . $host . "\n");
                $this->log_write("Error: " . $errstr . " (" . $errno . ")\n");
                continue;
            }
            $this->log_write("Connected to mx host " . $host . "\n");
            return true;
        }
        $this->log_write("Error: Cannot connect to any mx hosts (" . implode(", ", $MXHOSTS) . ")\n");
        return false;
    }

    private function smtp_message($header)
    {
        fputs($this->sock, $header . "\r\n");
        $this->smtp_debug("> " . str_replace("\r\n", "\n" . "> ", $header . "\n>"));
        return true;
    }

    private function smtp_sendbody($body)
    {
        $head = "\r\n\r\n" . '--' . $this->part_boundary;
        $head .= "\r\n" . 'Content-Type: text/html; charset="utf-8"';
        $head .= "\r\n" . 'Content-Transfer-Encoding: base64';
        $head .= "\r\n\r\n" . base64_encode($body);
        return fputs($this->sock, $head . "\r\n");
    }

    private function smtp_sendatt()
    {
        $head = '';
        foreach ($this->att as $n => $v) {
            $head .= "\r\n\r\n" . '--' . $this->part_boundary;
            $head .= "\r\n" . 'Content-Type: ' . get_mime(get_extname($n)) . '; charset="utf-8"; name="' . $n . '"';
            $head .= "\r\n" . 'Content-Disposition: attachment; filename="' . $n . '"';
            $head .= "\r\n" . 'Content-Transfer-Encoding: base64';
            $head .= "\r\n\r\n" . base64_encode($v);
        }
        return fputs($this->sock, $head . "\r\n");
    }

    private function smtp_sendend()
    {
        return fputs($this->sock, "\r\n\r\n" . '--' . $this->part_boundary . '--');
    }

    private function smtp_eom()
    {
        fputs($this->sock, "\r\n.\r\n");
        $this->smtp_debug(". [EOM]\n");
        return $this->smtp_ok();
    }

    private function smtp_ok()
    {
        $response = str_replace("\r\n", "", fgets($this->sock, 512));
        $this->smtp_debug($response . "\n");
        if (!mb_ereg("^[23]", $response)) {
            fputs($this->sock, "QUIT\r\n");
            fgets($this->sock, 512);
            $this->log_write("Error: Remote host returned \"" . $response . "\"\n");
            return false;
        }
        return true;
    }

    private function smtp_putcmd($cmd, $arg = "")
    {
        if ($arg != "") {
            if ($cmd == "") {
                $cmd = $arg;
            } else {
                $cmd = $cmd . " " . $arg;
            }
        }
        fputs($this->sock, $cmd . "\r\n");
        $this->smtp_debug("> " . $cmd . "\n");

        return $this->smtp_ok();
    }

    private function smtp_error($string)
    {
        $this->error .= "<br/>Error: Error occurred while " . $string . ".<br/>";
        return false;
    }

    private function log_write($message)
    {
        $this->log .= '<br/>' . $message . '<br/>';
        return true;
    }

    private function strip_comment($address)
    {
        $comment = "\\([^()]*\\)";
        while (mb_ereg($comment, $address)) {
            $address = mb_ereg_replace($comment, "", $address);
        }
        return $address;
    }

    private function get_address($address)
    {
        $address = mb_ereg_replace("([ \t\r\n])+", "", $address);
        $address = mb_ereg_replace("^.*<(.+)>.*$", "\\1", $address);
        return $address;
    }

    public function smtp_debug($message)
    {
        if ($this->debug) {
            $GLOBALS['email_debug'] .= $message . "<br>";
        }
    }
}
